Siemens S7-1500 Function Manual page 78

Organization block
Organization blocks (OBs) form the interface between the operating system of the CPU and
the user program. The organization blocks determine the order in which the user program is
executed.
Parameter
● Variable of a STEP 7 code block
● Variable for setting the behavior of a module (one or more per module). In delivery state,
each module has an appropriate basic setting that can be changed by configuring in
STEP 7. There are static and dynamic parameters.
Parameters, dynamic
In contrast to static parameters, you can change dynamic parameters of modules during
operation by calling an SFC in the user program, e.g. limit values of an analog input module.
Parameters, static
In contrast to dynamic parameters, you cannot change static parameters of modules with the
user program but only by configuring in STEP 7, e.g. input delay of a digital input module.
Primary CPU
When the R/H system is in RUN-Redundant system state, the Primary CPU controls the
process. The Backup CPU synchronously executes the user program and can take over the
process control at a failure of the Primary CPU.
Process image (I/O)
The CPU transfers the values from the input and output modules to this memory area. At the
start of the cyclic program, the CPU transfers the process image output as a signal state to
the output modules. The CPU then reads the signal states of the input modules to the
process image of the inputs. Then the CPU executes the user program.
Redundant systems
Redundant systems are characterized in that important automation components are present
multiple times (redundantly). Process control is maintained if a redundant component fails.
Reset to factory settings
Resetting to factory settings restores the CPU settings to the delivery state.
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
Glossary
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